149863domain: NAppears in sequencesa(n) = (1 + Sum_{j=1..K-2} a(n-j)*a(n-j-1))/a(n-K) with a(1),...,a(K)=1, where K=8.at n=12A283920Number of induced paths in the n-ladder graph P_2 X P_n.at n=18A360201